Nancy pulled five points clear of the automatic drop zone with a goalless draw against ninth-place Toulouse.
Adam Ounas scored a second-half brace off the bench to complete Bordeaux's late turnaround at Lille.
Giovanni Sio's lone goal helped Rennes edge last-place Lorient and climb to eighth in Ligue 1.
Karl Toko Ekambi's brace propelled Angers past SC Bastia, 3-0, for their third straight Ligue 1 victory.
After drawing with Toulouse last weekend, PSG face a near must-win in the Le Classique at Marseille if they hope to keep pace with Monaco.
Monaco gain some separation between themselves and Nice at the top of the table with an away win at Guingamp.